[Vol. U 

 2 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



The species of Cladoderris have the same internal structure as 

 those of Stereu7n, and the genus is distinguished from the latter 

 merely by the conspicuously ribbed configuration of the hymenial 

 surface. The genus is tropical in its geographical distribution, 

 although one species has been described from England and another 

 from Florida; the fructifications grow on rotten wood. The 

 earher gatherings, consisting of only one or two fructifications 

 at a time taken by explorers, sometimes had the stem central in 

 the specimens saved, at other times lateral, and at others, sessile. 

 Each such gathering was made the basis for a new species and the 

 species were arranged in the genus in central-stemmed, lateral- 

 stemmed, or sessile sections. Field observations and more ample 

 collections by mycologists have reduced many such species to 

 synonjTns and show that the above sections are of little value; 

 for in Cladoderris, as in the other Thelephoraceae growing on logs, 

 the inclination of the substratum at the point of attachment 

 and the position of the substratum as to whether over or under 

 the fructification are important in determining the habit and 

 form of the fructification, as already pointed out for Stereum 

 and Hymenochaete (Mo. Bot. Gard. Ann. 5: 302. 1918). 



Key to the Species 



Hymenium not at all or but slightly verrucose 1. C. dendritica 



Hymenium abundantly verrucose 2. C. floridana 



1. Cladoderris dendritica Persoon in Gaudichaud, Voy. Urania 

 Bot. 176. pi. 1, f. 4- 1826 (under Cladoderris of Thelephora); 

 L^veille, Ann. Sci. Nat. Bot. III. 2: 213. 1844; Fries, Fungi 

 Natal. 22, in K. Sv. Vet. Akad. Handl. 1848; Berk. & Curtis, 

 Linn. Soc. Bot. Jour. 10: 328. 1868; Sacc. Syll. Fung. 6: 549. 

 1888; Lloyd, Myc. Writ. 4: Syn. Cladoderris 3. text/. 520-523. 

 1913. Plate 1, fig. 1. 



Actinostroma crassum Klotzsch, Nova Acta Acad. Leop.-Carol. 

 19 : 237. 1843. — Cladoderris crassa (Klotzsch) Fries, Fungi Natal. 

 22, in K. Sv. Vet. Akad. Handl. 1848; Sacc. Syll. Fung. 6: 549. 

 1888. — C. Candolleana Leveille, Ann. Sci. Nat. Bot. III. 5: 153. 

 1846; Sacc. Syll. Fung. 6: 549. 1888; Lloyd, Myc. Writ. 4: 

 Syn. Cladoderris 10. 1913. 



